An early look at the just-in-time interactions that Scott has been working on:

Nearby works like this. An enabled object broadcasts a short description of itself and a URL to devices nearby listening. Those URLs are grabbed and listed by the app, and tapping on one brings you to the object’s webpage, where you can interact with it—say, tell it to perform a task.

Dear Santa Claus,
I have been a relatively good boy this year. Please may I have a t-shirt that actually detects and displays WiFi signal strength? No, I'm not kidding.
Give my love to the elves,
Jeremy.